KEKO and KEPH table

Hello All,
my requirement is like this
in the stock aging report, suppose user selects currency other than the item currency, then that should get calculated by using ther costing data in keko and keph table converting the amounts there into the selected currency.
what is the concept of group currency. and whether the conversion of currency in group of foreign currency is different?
is there any FM which will return the value by calculating the amount in keko and keph table.?

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